Motorcycle muffler



FIG. 1 is a front perspective view of a motorcycle muffler;

FIG. 2 is a top view of thereof;

FIG. 3 is a first end view thereof;

FIG. 4 is a second end view thereof opposite the view of FIG. 3;

FIG. 5 is a side view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines in the drawings represent environmental structure only and form no part of the claimed design. 

The ornamental design for a motorcycle muffler, as shown and described. 